<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="comman.css">
    <script src="zepto.js"></script>
</head>
<body>
    <form id="form1">
        <input type="submit" value="确定" id="sub">
    </form>

    <script src="comman.js"></script>
    <script src="alert.js"></script>
</body>
</html>